Materials Literature
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It is shown by dielectric resonance absorption at 60 GHz that there is a linear coupling of the electric field to the ground state of effective mass acceptors in Si reflecting the lower ${\mathit{T}}_{\mathit{d}}$ symmetry in the central portion of the ground-state wave function. The coupling increases strongly with i…
The author reports a study of room temperature photoluminescence, electromodulation and Raman scattering experiments on CdS x Se 1-x quantum dots of various sizes (18 AA to 108 AA) embedded in a glass matrix. The Raman experiment confirms that all the samples have the same semiconductor composition. Electromodulation…
We report results from computer simulations of the kinetics of domain growth and wetting in a binary liquid mixture contained inside a model porous medium which has an interconnected and tortuous structure resembling Vycor glass. We find that the growth process slows down dramatically when the average size of the doma…
The structural order of the two-dimensional (2D) charge-density-wave (CDW) phase in ${\mathrm{Nb}}_{\mathit{x}}$${\mathrm{Ta}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{S}}_{2}$ materials has been determined as a function of impurity concentration from the quantitative analysis of scanning tunneling microscopy im…
All vacuum-deposited metal/semiconducting polyaniline hetrojunction Schottky devices using vacuum-evaporated polyaniline films of a thickness of the order of 0.1 μm have been prepared. Schottky junctions have been formed using the following metals, Al, Sn, In, Pb, Sb, and Ag. Electrical characterization has been carri…
Epitaxial, boron-doped diamond films were grown by hot-filament-assisted chemical vapour deposition (CVD) on (100) and (110) natural diamond substrates. Resistivity measurements for 10 K<T<500 K showed a clear transition from band to hopping conduction upon lowering of temperature. In the band conduction regime, the (…
We present results of photoluminescence experiments performed at 2 and 300 K on porous silicon layers with different porosities. The samples are obtained by electrochemical dissolution of (100) silicon wafers in hydrofluoric solution. The energy of the photoluminescence and its variation with porosity are found in goo…
The correlation lengths of vitreous structures estimated from the low-frequency (boson) peak in Raman spectra and from the width of the first sharp diffraction peak are compared. This first comparison shows that the two estimates, which are based on dynamic and static properties, respectively, are in good quantitative…
Abstract The influence of natural, activated, and modified microzeolite with the general formula Me 2/ m · Al 2 O 3 · n SiO 2 · p H 2 O (where Me = Fe 3+ , Ca 2+ , Mg 2+ , Zn 2+ , K + , Na + ) and an organic additive, such as ammonium sulfamate combined with ammonium sulfate on smoke formation and flammability of susp…
Abstract High‐molecular‐weight polyethylene (HMWPE) sheets have been cold rolled biaxially to different reductions in thickness. After 40% or more reduction in thickness by cold rolling, the stress‐whitening phenomenon in HMWPE was eliminated. To find out the reason of elimination of stress whitening by cold rolling,…
Abstract The binary blend of high‐density polyethylene (HDPE) and linear low‐density polyethylene (LLDPE) in the range of composition from 100% HDPE to 100% LLDPE has been investigated for tensile and flexural properties and the morphology in the deformed state on tensile fracture. Tensile properties (initial modulus,…
Abstract The enzyme glucose oxidase (GOD) was immobilized on the nonwoven fabrics, which have excellent properties in diffusivity of substrates, mechanical strength, and handling, with Bombyx mori silk fibroin gel. The nonwoven fabrics of silk fibroin, viscose rayon, poly‐ethyleneterephthalate, 6‐nylon, and polypropyl…
Abstract The thermal degradation of virgin and HCI‐treated PVC in powder form, as well as of PVC films of different thicknesses, has been studied as a function of time and temperature. The rate of dehydrochlorination was determined conductimetrically and from the polyene sequence distributions as obtained by UV spectr…
Graphite components of a High Temperature Gas-Cooled Reactor (HTGR) core will be subjected to fast neutron irradiation-induced damages causing changes in engineering properties which are dependent significantly on irradiation temperature and neutron fluence. A Graphite Damage Model (GDM) elaborated to interpret observ…
Abstract Thermoplastic epoxy resins have some special applications. In this study, the diglycidyl ether of bisphenol‐A and three different monoamines—butylamine, hexamine, and dodecylamine—at different epoxy–amine ratios were used to make epoxy resins. Relative viscosity, hardness, Vicat softing temperature, volume re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControlled potential coulometric method to determine the average titanium oxidation state of titanium chlorides in sodium chlorideCharles E. BaumgartnerCite this: Anal. Chem. 1992, 64, 17, 2001–2002Publication Date (Print):September 1, 1992Publication History Published onlin…
Abstract Whenever asymmetrical winding arrangements of transformers are to investigate, the use of three‐dimensional calculation methods is essential. In this paper an alternative method to the classical Finite Element formulation is used, based on reduced and total scalar potentials. The basic equations of this metho…
Abstract Tetragonal zirconia ( t - ZrCO 2 ) can be stabilized with 15 to 22 mol% YTaO 4 . X-ray powder diffraction data for the end members of the solid solution series Zr 0.76 Y 0.12 Ta 0.12 O 2 and Zr 0.66 Y 0.17 Ta 0.17 O 2 are reported along with lattice parameters across the single phase region. These tetragonal…
Impurity effects of Nb+5 dopants were investigated on optimum calcination temperatures and grain growth in sintering process. As the amount of Nb+5 dopant increased, optimum calcination temperatures increased. Grain sizes in sintered ceramics decreased in inverse proportion to the amount of Nb+5. Experimental results…
Abstract Nonlinear kinetics of both spinodal decomposition at early stages, and the dissolution of homogeneities formed during spinodal decomposition, is studied. Variation of the scattering intensity during a complete cycle consisting of a step temperature change from T 1 in the one‐phase region to T 2 in the two‐pha…